利用handler实现定时器的两种方法

不多说，直接上 
Handler两种方式
第一种：
package com.example.demo;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Intent;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android.widget.Toast;

public class MainActivity extends Activity {
	private EditText editText1;
	TextView textView1;
	Handler handler = new Handler();
	Runnable runnable = new Runnable() {

		@Override
		public void run() {

			handler.postDelayed(this, 2000);
			Toast.makeText(MainActivity.this, "YQY_Editor", Toast.LENGTH_SHORT).show();
		}
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		textView1 = (TextView) findViewById(R.id.textView1);
		textView1.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
				handler.postDelayed(runnable, 2000);
			}
		});
	}

}
第二种：
package com.example.demo;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Intent;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android.widget.Toast;

public class MainActivity extends Activity {
	private EditText editText1;
	TextView textView1;
	Handler handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case 1:

				Toast.makeText(getApplicationContext(), "aaa", 3000).show();
				break;
			default:
				break;
			}
		};
	};


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		textView1 = (TextView) findViewById(R.id.textView1);
		textView1.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
				new Thread(new MyThread()).start();
			}
		});
	}
	public class MyThread implements Runnable{

		@Override
		public void run() {
			// TODO Auto-generated method stub
			while (true) {
			try {
				Thread.sleep(3000);
				Message msg=new Message();

				msg.what=1;
				handler.sendMessage(msg);

			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}


			}
		}
	}


}<pre name="code" class="java">调用handler.removeCallbacks(runnable);停止线程
package com.example.demo;


import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android.widget.Toast;

public class MainActivity extends Activity {
	private TextView editText1;
	static Context context;
	TextView textView1;
	Handler handler = new Handler();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		textView1 = (TextView) findViewById(R.id.textView1);
		editText1 = (TextView) findViewById(R.id.editText1);
		context = this;
		editText1.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				handler.removeCallbacks(runnable);
			}
		});
		textView1.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
				handler.post(runnable);
			}
		});
	}

	Runnable runnable = new Runnable() {

		@Override
		public void run() {
			// TODO Auto-generated method stub
			Toast.makeText(context, "aaa", 3000).show();
			handler.postDelayed(runnable, 2000);
		}
	};

}